Experimental Study On Mechanical Properties Of Corrugated Steel Plate And Rubber Concrete Composite Deck

In recent years,the steel-concrete composite slab has been gradually applied in the field of bridge engineering and began to form technical specifications.In this paper,the experimental research on the corrugated steel plate and rubber concrete composite deck has been carried out.Corrugated steel plate has a large bending stiffness,which can not only participate in the force,but also serve as a template in the construction process;rubber concrete has good crack resistance,fatigue resistance,impact resistance and vibration resistance,and recycling the waste rubber,a black pollution source,has made a contribution to the protection of the environment.In this paper,eight groups of corrugated steel plate and rubber concrete push-out specimens and two groups of corrugated steel plate and rubber concrete composite deck are studied by the method of experimental research and finite element simulation.The main work and results are as follows:(1)Eight groups of corrugated steel plate and rubber concrete push-out specimens were tested to explore the influence of stud diameter,stud spacing,stud height,connection mode and concrete type on the bearing capacity of corrugated steel plate-concrete interface.The test phenomenon and load slip curve were recorded.The analysis shows that the rubber concrete can effectively restrain the spread of cracks;the corrugation shape leads to the decrease of the shear strength and splitting strength of concrete,which should be considered in the design and layout of shear studs;the interface shear capacity calculated by relevant codes at home and abroad is compared with the test results,among which the calculation formula of connectors in the code for design of steel and concrete composite bridges considering the influence of the elastic modulus of the concrete,the calculation results are close to the test results when the stud connector does not have structural failure.(2)Two composite deck slabs of corrugated steel plate and concrete were tested by four point loading,and the two composite slabs were all damaged by longitudinal shear.The failure mode,load deflection curve and load slip curve of rubber concrete composite slab and ordinary concrete composite slab are similar.Both composite slabs are ductile components and rubber concrete composite slab has higher ductility.In the elastic stage,the composite slab conforms to the assumption of plane section at the loading point and midspan.After the interface slip occurs,the concrete and corrugatedsteel plate gradually form two middle sections.The steel base plate of the composite deck of rubber concrete bears a larger proportion of the load.(3)Based on the theoretical analysis of the bearing capacity and bending rigidity of the composite deck,the judgment method of the failure mode of the composite deck is given.The longitudinal shear bearing capacity of the rubber concrete composite slab is close to that of the ordinary concrete composite slab and the calculation results are in good agreement with the test results.According to the standard for design of steel structures,the deflection in the middle of the span calculated by the reduced stiffness method is in good agreement with the test results,which is more safe.Combining with the theoretical formula to optimize the bearing capacity of the composite deck,it can be seen that when the interface bearing capacity is insufficient,increasing the number of studs can effectively improve the bending performance of the composite deck.Improve the concrete thickness can improve the bending bearing capacity of the composite deck,and at the same time,the self weight is obvious significantly increased.(4)ABAQUS is used to establish a three-dimensional nonlinear finite element model,and the mechanical properties of the composite deck of corrugated steel plate and rubber concrete are slightly lower than that of the ordinary composite deck;the composite deck of corrugated steel plate and the composite deck of flat steel plate have similar bending capacity,the former has higher longitudinal shear capacity.